WordPress Meta Boxes above the Editor. Including a sortable content area.

functions.php

<?php
/**
 * Prints all metaboxes with the above context
 * above the editor
 */
function themeplugin_prefix_meta_box_above() {
    global $post;
    echo '<div id="postbox-container-3" class="postbox-container">';
        do_meta_boxes( get_current_screen(), 'above', $post );
    echo '</div>';
}

add_action( 'edit_form_after_title', 'themeplugin_prefix_meta_box_above' );

// In the add_meta_box call, in the context parameter, 
// which normally allows 'normal', 'advanced' or 'side' instead use 'above' 

something.css

#postbox-container-3 {
    float:none;
}

#post-body #above-sortables {
    min-height:50px;
}